商苑面馆:选择结构
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if条件语句
单个if语句
package test; import java.util.Scanner; public class TestIf1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner sc = new Scanner(System.in); System.out.println("客官,请问您是堂吃还是外送?" +"1.堂吃/2.外送"); String s = sc.next(); if(s.equals("1")){ System.out.println("堂吃一位!"); }else{ System.out.println("外送一位!"); } sc.close(); } }
连续if语句
package test; import java.util.Scanner; public class TestIf2 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner sc = new Scanner(System.in); System.out.println("您几位?"); int num = sc.nextInt(); System.out.println("客官,请问你们吃什么面?"); System.out.println("a.老北京炸酱面;b.刀削面" +"c.油泼面"); String s = sc.next(); if(s.equals("a")){ System.out.printf("老北京炸酱面%d碗",num); }else if(s.equals("b")){ System.out.printf("刀削面%d碗",num); }else if(s.equals("c")){ System.out.printf("油泼面%d碗",num); }else{ System.out.println("不好意思,您需求的面我们这里没有"); } sc.close(); } }
if语句的多条件
在if语句中放置多个条件,他们是'逻辑或'或 '逻辑与'的关系:
import java.util.Scanner; public class TestIf3 { public static void main(String[] args) { // TODO Auto-generated method stub float price ;boolean fenqi;boolean firstpay; System.out.println("老板,请问手机多少钱?"); Scanner sc = new Scanner(System.in); price = sc.nextFloat(); System.out.println("老板,请问支不支持分期?"); fenqi = sc.nextBoolean(); System.out.println("老板,请问支不支持零首付?"); firstpay = sc.nextBoolean(); if(price <=1000 && fenqi == true && firstpay == true) { System.out.println("小Case!"); }else { System.out.println("太贵了,买不起~"); } } }